package com.mmall.concurrency;

import com.mmall.concurrency.annoations.NotThreadSafe;
import lombok.extern.slf4j.Slf4j;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Semaphore;

@Slf4j
@NotThreadSafe
public class ConcurrencyTest {
    public static Logger log = LoggerFactory.getLogger(ConcurrencyTest.class);
    public static int clientTotal = 5000;
    public static int threadTotal = 200;
    public static int count = 0;
    public static void main(String[] args) throws Exception{
        ExecutorService executorService = Executors.newCachedThreadPool();
        //信号量，当线程超过这个就不会执行
        final Semaphore semaphore = new Semaphore(threadTotal);
        final CountDownLatch countDownLatch = new CountDownLatch(clientTotal);
        for(int i = 0;i<clientTotal;i++){
            executorService.execute(()->{
                try{
                    semaphore.acquire();
                    add();
                    semaphore.release();
                }catch (Exception e){
                    log.error("exception {}",e.getMessage());
                }
                countDownLatch.countDown();
            });
        }
        countDownLatch.await();
        executorService.shutdown();
        log.info("count:{}",count);

    }
    private static void add(){
        count++ ;
    }

}
